Rolling door



H. A. JOHNSON.

Patented July 6, 1920.

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APPLICATION FILED MAY24| 1919.

1 34:5,44T Batented July 6, 1920.

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HOWARD A. JOI-INSON, OF NORFOLK, VIBGINIA.

ROLLING DOOR.

Specification ol!y Letters Patent. 4 Patented July 6, 1920.

Application vfiled May 24, 1919. Serial No. 209,476.

To all whom' it may concern:

Be it known that I, HowARn A. J oHNsoN, a citizen of the United States,and residing at Norfolk, Norfolk county, State of Virginia, haveinvented certain new and useful mprovements in Rolling Doors, of whichthe following is a specification.

The present invention relates to rolling doors and more particularly tothe type comprising metal slats or sections hinged together and adaptedto be wound up into a coil at the top of'the door.

The principal feature of the present invention resides in the means forsecuring` the top of the door to the wheels of barrels on the headshaft. Other features and objects of novelty will be apparent from thedescription taken in connection with the drawings in which:

Figure 1 is a top plan view of a part of a door Constructed inaccordance with the present invention; and

Fig. 2 is a sectional elevation taken substantially on the line 2 2 ofFig. 1.

Referring to the drawings the numeral 10 indicates the head shaft of theusual construction having Secured thereto and spaced therealong theWheels or barrels 11. The closure part of the door is made up of metalsections or slats 12 having their longitudinal edges hinged together inany suitable manner as indicated at 13.'

Heretofore the top member 14 of the closure portion of the door has beenSecured directly to the wheels or barrels by pin fastenings, such asbolts or rivets. This type of fastening may fail either by shearing thepins or the pins crushing through the top member. The shearing Strengthof the pins may be increased by increasing their diametrs but of coursethere is a limit to the size which may be employed. Likewise theresistance to crushing through the top member also increases with thediameter of the pins.v but not so rapidly as the shearing resistance ofthe pins. Of course the crushing resistance of the top member is alsoincreased if it is made thicker. but the thickness of this top member islimited and should not be much greater, than the thickness of the otherslats constituting the door closure.` It will be apparent. therefore, inorder to properly secure the top member to the barrels. a suflicientnumber of pins must be provided. This means, therefore, that arelatively large number of wheels or barrels must4 be used toaccommodate these pins.

According to the present invention means for securing the top member tothe wheels is employed which permits the use of only a small number ofwheels and yet ives as strong a fastening as is necessary. I` his resultis accomplished by attaching the top member of the flexible doorsections to a bar by means of as many pins as desired, and providing aconnection between the bar and wheels which is as strong or strongerthan the connection of the top member to said bar. As shown, the wheels11 have a substantially spiral periphery the beginning of the spiralbeing indicated at 15 and the end at 16, this latter part having agreater radius than the beginning of the spiral at 15.

Between the points 15 and 16 the periphery of the wheel is provided witha fiat surface 15' and is formed with a transverse slot 17. An angleiron 18 is disposed with the inner surface of one leg resting on thefiat portions 15' of the wheels and the other leg disposed in saidslots. The top member 14 of the door is Secured to the first mentionedleg of the angle iron by pin fastenings such as bolts 19. It will beobserved that4 as many -bolts as desired may be employed as the angleiron is of substantially .the same length as the top member 14.Gonsequently, thev top member is Secured to the angle iron by fasteningmeans which are strong enough to resist all forces coming on the same.vOn the other hand, the angle iron being connected to the wheels byhaving a leg disposed in the transver'se slots provides practically anunbreakable connection. Furthermore, as the angle iron extends from endto end of the door a'nd is a rigid member, only a few wheels or barrelsare necessary. Although an angleiiron has been described as beingemployed to secure the top member to the wheels, it is obvious that barsof other cross sectional shape might be employed the principalrequirement being that) the bar have a surface thereof abutting asurface on the Wheel tofhold it from displacement, due to the pull ofthe door.

Although a Specific embodiment of thev invention has been described indetail. it is to be understood that the invention is not thus limitedbut includes modifications and changes which come within the scope ofthe appended claims.

1 `;Hai'i11g thus described the invention what 1. rolling doorconstruction including in combination, a head shaft, spaced Wheelssccured to said'shaft, each wheel having a transrerse slot in itsperiph'ery, an angle mf ndisposed parallel tothe shaft with one v in theslot of the wheels, and a flexible IU leg of said angle iron.

door secured at its upper-edge to the other 2. A rolling doorconstruction including in combination, a liead shaft. s'paced wheelsSecured to said shaft, each wheel having a It'ransvcrse slot' in itsperiphery, an angle iron dispose'd parallel to the shaft with one leg in-the slot of the wheels. a flexible door, and pi'ns securing the uppermember of the door tothe other leg of the angle, the number of pinsbeing greater than the number of Wheels.

3. A\ro1li1'1g door construction including in combination. a head shaft,spaced wheels sccured to said shaft, each wheel having a lransvcrse slotin its periphery, a bar disposed parallel to lthe shaft having aprojection seated in the slot of each wheel, and a flexible door Securedat its upper edge to said bar.

4. A` rolling door construction including in combination, a head shaft,spaced wheels securedto said shaft, each Wheel having a' transverseslot'in its periphery, a bar disposed parallel to the shaft and bearingagainst the surface bounding o'ne side of said slots whereby said bar isheld against movement circuinferentially of the wheels, and a flexibledoor secured at its upper edge to said bar.

5. As an article of manufacture, a wheel or barrel for rolling doorshaving a spiral peripheral surface, the beginning and end of the spiralbeing connccted by a substautially radial surface and the spiral surfaceadjacent its point of least radius formed with a transverse slot.

6. As an article of manufacture` a wheel or barrel for rolliug doorshaving a spiral peripheral surface` formed with a trans= verse slotadjacent the point of least radius.

In testiniony whereof l attix mv Signature.

HOlVARD A. JO'IINH

